It is known that componentWillUnmount() Before the component will be unloaded , Be performed .
So how to manually unload a component , With ( Trigger the execution of the method to ) Verify the rule ？
Call the following API that will do ：ReactDOM.unmountComponentAtNode(container).

// Components element Render to container in 
ReactDOM.render(element, container);
// uninstall container Components in , timing 5s After execution 
setTimeout(function() {

ReactDOM.unmountComponentAtNode(container);
}, 5000);